Hebrews 6:16

Indeed men swear [an oath] by one greater than themselves, and with them [in all disputes] the oath serves as confirmation [of what has been said] and is an end of the dispute.

Exodus 22:11

then an oath before the Lord shall be made by the two of them that he has not taken his neighbor’s property; and the owner of it shall accept his word and not require him to make restitution.

Genesis 14:22

But Abram said to the king of Sodom, “I have raised my hand and sworn an oath to the Lord God Most High, the Creator and Possessor of heaven and earth,

Genesis 21:23

so now, swear to me here by God that you will not deal unfairly with me [by breaking any agreements we have] or with my son or with my descendants, but as I have treated you with kindness, you shall do the same to me and to the land in which you have sojourned (temporarily lived).”

Genesis 21:30-31

Abraham said, “You are to accept these seven ewe lambs from me as a witness for me, that I dug this well.”

Genesis 31:53

The God of Abraham [your father] and the God of Nahor [my father], and the god [the image of worship] of their father [Terah, an idolater], judge between us.” But Jacob swore [only] by [the one true God] the Fear of his father Isaac.

Joshua 9:15-20

Joshua made peace with them and made a covenant (treaty) with them, to let them live; and the leaders of the congregation [of Israel] swore an oath to them.

2 Samuel 21:2

So the king called the Gibeonites and spoke to them (now the Gibeonites were not of the sons (descendants) of Israel but of the remnant (survivors) of the Amorites. The Israelites had sworn [an oath] to [spare] them, but Saul in his zeal for the sons of Israel and Judah had sought to strike down the Gibeonites).

Ezekiel 17:16-20

As I live,’ says the Lord God, ‘surely in the country of the king (Nebuchadnezzar) who made Zedekiah [the vassal] king, whose oath he despised and whose covenant he broke, in Babylon Zedekiah shall die.

Matthew 23:20-22

Therefore, whoever swears [an oath] by the altar, swears both by it and by everything [offered] on it.

Hebrews 6:13

For when God made the promise to Abraham, He swore [an oath] by Himself, since He had no one greater by whom to swear,

Treasury of Scripture Knowledge

Summary

For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.

Bible References

An oath

Genesis 21:30
Abraham said, “You are to accept these seven ewe lambs from me as a witness for me, that I dug this well.”
Genesis 31:53
The God of Abraham [your father] and the God of Nahor [my father], and the god [the image of worship] of their father [Terah, an idolater], judge between us.” But Jacob swore [only] by [the one true God] the Fear of his father Isaac.
Exodus 22:11
then an oath before the Lord shall be made by the two of them that he has not taken his neighbor’s property; and the owner of it shall accept his word and not require him to make restitution.
Joshua 9:15
Joshua made peace with them and made a covenant (treaty) with them, to let them live; and the leaders of the congregation [of Israel] swore an oath to them.
2 Samuel 21:2
So the king called the Gibeonites and spoke to them (now the Gibeonites were not of the sons (descendants) of Israel but of the remnant (survivors) of the Amorites. The Israelites had sworn [an oath] to [spare] them, but Saul in his zeal for the sons of Israel and Judah had sought to strike down the Gibeonites).
Ezekiel 17:16
As I live,’ says the Lord God, ‘surely in the country of the king (Nebuchadnezzar) who made Zedekiah [the vassal] king, whose oath he despised and whose covenant he broke, in Babylon Zedekiah shall die.

General references

Genesis 21:24
And Abraham said, “I will swear.”
Isaiah 54:9

“For this is like the waters of Noah to Me,
As I swore [an oath] that the waters of Noah
Would not flood the earth again;
In the same way I have sworn that I will not be angry with you
Nor will I rebuke you.
Micah 7:20

You shall give truth to Jacob
And lovingkindness and mercy to Abraham,
As You have sworn to our forefathers
From the days of old.
Luke 1:73

The oath which He swore to Abraham our father,